Jonas Holm

Senior Associate, Member of the Finnish Bar, M.Sc. (Econ.)

Services

  1. Environment, Energy & Green Transition

Contact details

I advise clients on energy law matters, industrial and infrastructure projects, and contractual issues related to these sectors.

A key part of my work is an interdisciplinary approach and understanding the diverse forces that shape the landscape in which companies operate. Businesses that understand the regulatory, political, economic and commercial realities of an increasingly interconnected world gain a competitive advantage. I provide holistic and strategic legal advice that goes beyond regulatory considerations by incorporating interdisciplinary and commercial insights.

I am currently pursuing doctoral studies in energy law. In addition to my law degree, I hold a Master’s degree in economics, which enables me to bridge legal analysis with commercial strategy.

Before joining Castrén & Snellman, I advised both Finnish and international industrial companies, as well as private equity sponsors, at another leading law firm. My experience spans complex transactions and regulatory frameworks, always with a focus on delivering pragmatic, business-oriented solutions. This multidisciplinary foundation allows me to provide specific advice to diverse stakeholders and to help our clients build sustainable success stories.

Latest references

Oomi Solar – Sale of a Solar Power Plant and Battery Energy Storage Project
We advised Oomi Solar Oy on the sale of a solar power park and battery energy storage project to Tuulipolar Oy. The transaction concerned a 24 MWp solar power plant and a 36 MW / 70 MWh battery energy storage system (BESS) to be constructed in Tornio. Tuulipolar Oy will act as the owner and operator of the plant, while Oomi Solar Oy will be responsible for its design and construction. The project will form the world’s northernmost industrial hybrid power plant, contributing to Finland’s green energy transition by increasing renewable energy production and electricity storage capacity in Northern Finland. The hybrid solution enables optimization of production as well as active participation in electricity markets and reserve services, improving the project’s profitability and supporting the balance of the electricity system year-round. Electricity production from the hybrid plant is expected to begin in 2028. Oomi Solar Oy is a Finnish renewable energy expert with experience from nearly 200 MW of installed solar capacity. The company helps businesses and communities accelerate the green transition by offering comprehensive solutions, including solar power plants, energy storage systems, and related lifecycle services from project development to maintenance. Oomi Solar Oy employs more than 20 energy professionals and delivers solar power projects across Finland. The company’s vision is to be Finland’s most desired partner for solar energy and energy solutions.
Case published 5.6.2026
Nscale – Data centre project
Castrén & Snellman advised Nscale, a European AI infrastructure company, in connection with its planned data centre project in Harjavalta, Finland. The facility will be located in the Sievari industrial area. Castrén & Snellman’s advisory role encompassed the negotiation and execution of a site securing and development agreement (SSDA) with Fortum, as well as the preliminary land sale process for the Sievari site with the Town of Harjavalta. Under the SSDA, Fortum supports the advancement of Nscale’s project development, including grid connection design and permitting.
Case published 15.4.2026
Downing – Acquisition of the entire share capital of Tornionlaakson Voima
We advised UK-based investment company Downing in its acquisition of the entire share capital of Tornionlaakson Voima Oy. Tornionlaakson Voima owns three hydropower plants in the Tengeliönjoki river system – the Portimokoski power plants in Ylitornio, the Jolmankoski power plants in Raanujärvi and the Kaaranneskoski power plants in Sirkkakoski. The power plants produce a total of approx. 45 gigawatt-hours of electricity per year. Tornionlaakson Voima’s daily operations will continue normally, and the transaction will not affect customers. The consummation of the transaction is subject to the approval of the Ministry of Economic Affairs and Employment. Downing has over 35 years’ experience in providing a wide range of investment solutions to the needs of institutional investors, advisers and retail investors. The company manages over £2 billion in assets in both the private and public markets and its current hydro power portfolio includes approx. 50 hydro power plants in the Nordics. 
Case published 27.3.2026
Brookfield – EUR 1 billion holdco financing for DayOne Data Centers
We advised a leading global investment firm Brookfield, alongside a global sovereign wealth investor, on the Finnish law aspects of a EUR 1 billion holdco financing for DayOne Data Centers, a Singapore-headquartered developer and operator of hyperscale data centres. Structured as a seven-year secured holdco financing facility of €500 million, expandable to €1 billion – and secured by DayOne’s Finland platform – the financing will support the rollout of hyperscale developments in Lahti and Kouvola, providing nearly 300MW of planned capacity across Finland. The proceeds will also support DayOne’s global expansion across the EU and APAC, with flexibility to allocate to other key growth markets as required.
Case published 29.1.2026
Shareholders – Sale of the Suomen Autohuolto Group
We advised the shareholders of Suomen Autohuolto Oy in connection with the sale of the company’s entire share capital, to SAKA Finland Group Oy. Suomen Autohuolto Group is one of Finland’s largest companies specializing in brand-specific automotive maintenance and has locations in Oulu, Tampere, and from July, also in Järvenpää. The transaction is subject to final approval by the Finnish Competition and Consumer Authority (KKV).
Case published 26.6.2026
AI training
Natural Resources Institute Finland – AI training
We delivered two tailor-made AI workshops for the lawyers at the Natural Resources Institute Finland (Luke). We discussed the AI revolution and its impact on lawyers’ ways of thinking and working, and left the participants with practical solutions for enhancing and streamlining their work with Legora. Our AI-specialist lawyers prepared use cases tailored to Luke and the needs of public administration, which Luke received for its own use following the workshops. These use cases covered topics such as: utilising legal sources and the organisation’s own data to maximise AI results building and leveraging AI workflows AI-enhanced contract drafting based on a large volume of documents. The workshops sparked wide-ranging discussion on the role and benefits of AI in legal work. Participants appreciated how clearly and comprehensively our experts were able to present the nature and benefits of AI specifically within a legal context. ‘The workshops provided excellent support for Luke’s goal of leveraging AI responsibly and gave us concrete and ready-to-use practical takeaways,’ says Hannu Laitinen, Luke’s Senior Vice President, Administrative Affairs.
Case published 26.6.2026
Finnish Construction Management Consultancy — District Court Dismisses charge in occupational safety offence case concerning a safety coordinator
We successfully represented a Finnish construction management consultancy and a safety coordinator employed by the company in criminal proceedings concerning an alleged occupational safety and health offence. The prosecutor sought a penalty for an alleged breach of occupational safety regulations. The charge arose from a fall accident at a construction site where our client acted as the safety coordinator appointed by the developer. We assessed the scope of the safety coordinator’s duties in relation to the responsibilities of the main contractor, as well as how our client had fulfilled their obligations in practice. We demonstrated that our client had acted with due care and in full compliance with their duties throughout the planning, preparation and execution of the construction project. The District Court of Eastern Uusimaa dismissed the charge against our client. The Court held that our client, in their capacity as safety coordinator, had duly fulfilled the occupational safety obligations incumbent on the developer during the planning and preparation phases of the construction project and had not been aware of the fall protection deficiency identified at the site. The judgment is final insofar as our client is concerned.
Case published 22.6.2026
Efima – Sale of financial management services business
We advised Efima Oyj on the sale of its financial management services business to Rantalainen as part of its strategic focus on fully concentrating on the delivery of business applications as well as data and AI solutions. As a result of the transaction, customer contracts related to financial management services and 65 experts working in these services will transfer to Rantalainen. The transaction will be carried out as a transfer of business, and the experts will move to the new owner as existing employees. Efima is a Finnish digital company that supports the sustainable growth of large and mid-sized companies by streamlining their business processes and by creating competitive advantage through the innovative use of artificial intelligence and data. The company has nearly 200 experts based in Helsinki and Tampere.
Case published 12.6.2026

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